Asus M4A785TM Owner's manual

Motherboard

M4A785T-M

ii

No part of this manual, including the products and software described in it, may be reproduced,

transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any

means, except documentation kept by the purchaser for backup purposes, without the express written

permission of ASUSTeK Computer Inc. (“ASUS”).

Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless

such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the

product is defaced or missing.

ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS

OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS

DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,

LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),

EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY

DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.

SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR

INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,

AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO

RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS

MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.

Products and corporate names appearing in this manual may or may not be registered trademarks or

copyrights of their respective companies, and are used only for identication or explanation and to the

owners’ benet, without intent to infringe.

E4903

First Edition V1

August 2009

iii

Contents

Notices ......................................................................................................... vi

Safety information ..................................................................................... vii

About this guide ....................................................................................... viii

M4A785T-M specications summary ......................................................... x

Chapter 1: Product introduction

1.1 Welcome! ...................................................................................... 1-1

1.2 Package contents .........................................................................

1-1

1.3 Special features ............................................................................

1-1

1.3.1 Product highlights ...........................................................

1-1

1.3.2 Innovative ASUS features ...............................................

1-3

1.4 Before you proceed .....................................................................

1-5

1.5 Motherboard overview .................................................................

1-6

1.5.1 Placement direction ........................................................

1-6

1.5.2 Screw holes ....................................................................

1-6

1.5.3 Motherboard layout .........................................................

1-7

1.5.4 Layout contents ...............................................................

1-7

1.6 Central Processing Unit (CPU) ...................................................

1-8

1.6.1 Installing the CPU ...........................................................

1-8

1.6.2 Installing the heatsink and fan ......................................

1-10

1.7 System memory .........................................................................

1-11

1.7.1 Overview ........................................................................

1-11

1.7.2 Memory congurations ..................................................

1-12

1.7.3 Installing a DIMM ..........................................................

1-16

1.7.4 Removing a DIMM ........................................................

1-16

1.8 Expansion slots ..........................................................................

1-17

1.8.1 Installing an expansion card .........................................

1-17

1.8.2 Conguring an expansion card .....................................

1-17

1.8.3 PCI slots ........................................................................

1-17

1.8.4 PCI Express x1 slot .......................................................

1-17

1.8.5 PCI Express x16 slot .....................................................

1-17

1.9 Jumpers ......................................................................................

1-18

1.10 Connectors .................................................................................

1-19

1.10.1 Rear panel ports ...........................................................

1-19

1.10.2 Internal connectors .......................................................

1-22

iv

Contents

1.11 Software support ........................................................................ 1-29

1.11.1 Installing an operating system ......................................

1-29

1.11.2 Support DVD information ..............................................

1-29

Chapter 2: BIOS information

2.1 Managing and updating your BIOS ............................................ 2-1

2.1.1 ASUS Update utility ........................................................

2-1

2.1.2 ASUS EZ Flash 2 ............................................................

2-2

2.1.3 ASUS CrashFree BIOS ...................................................

2-3

2.2 BIOS setup program ....................................................................

2-4

2.2.1 BIOS menu screen ..........................................................

2-5

2.2.2 Menu bar .........................................................................

2-5

2.2.3 Navigation keys ...............................................................

2-5

2.2.4 Menu items .....................................................................

2-6

2.2.5 Submenu items ...............................................................

2-6

2.2.6 Conguration elds .........................................................

2-6

2.2.7 Pop-up window ...............................................................

2-6

2.2.8 Scroll bar .........................................................................

2-6

2.2.9 General help ...................................................................

2-6

2.3 Main menu ....................................................................................

2-7

2.3.1 System Time ...................................................................

2-7

2.3.2 System Date ...................................................................

2-7

2.3.3 Primary IDE Master/Slave, SATA 1~6 .............................

2-7

2.3.4 SATA Conguration .........................................................

2-8

2.3.5 System Information .........................................................

2-9

2.4 Advanced menu ...........................................................................

2-9

2.4.1 JumperFree Conguration ..............................................

2-9

2.4.2 CPU Conguration ........................................................

2-12

2.4.3 Chipset ..........................................................................

2-13

2.4.4 Onboard Device Conguration ......................................

2-14

2.4.5 PCIPnP .........................................................................

2-15

2.4.6 USB Conguration ........................................................

2-15

2.5 Power menu ................................................................................

2-16

2.5.1 Suspend Mode ..............................................................

2-16

2.5.2 ACPI 2.0 Support ..........................................................

2-16

v

Contents

2.5.3 ACPI APIC Support ....................................................... 2-16

2.5.4 APM Conguration ........................................................

2-16

2.5.5 HW Monitor Conguration .............................................

2-17

2.6 Boot menu ..................................................................................

2-18

2.6.1 Boot Device Priority ......................................................

2-18

2.6.2 Boot Settings Conguration ..........................................

2-18

2.6.3 Security .........................................................................

2-19

2.7 Tools menu .................................................................................

2-20

2.7.1 ASUS EZ Flash 2 ..........................................................

2-20

2.7.2 Express Gate ................................................................

2-21

2.7.3 AI NET 2

........................................................................ 2-21

2.8 Exit menu ....................................................................................

2-22

vi

Notices

Federal Communications Commission Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two

conditions:

• This device may not cause harmful interference, and

• This device must accept any interference received including interference that may cause

undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital

device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide

reasonable protection against harmful interference in a residential installation. This

equipment generates, uses and can radiate radio frequency energy and, if not installed

and used in accordance with manufacturer’s instructions, may cause harmful interference

to radio communications. However, there is no guarantee that interference will not occur

in a particular installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment off and on, the user

is encouraged to try to correct the interference by one or more of the following measures:

•

Reorient or relocate the receiving antenna.

•

Increase the separation between the equipment and receiver.

•

Connect the equipment to an outlet on a circuit different from that to which the receiver is

connected.

•

Consult the dealer or an experienced radio/TV technician for help.

The use of shielded cables for connection of the monitor to the graphics card is required

to assure compliance with FCC regulations. Changes or modications to this unit not

expressly approved by the party responsible for compliance could void the user’s authority

to operate this equipment.

Canadian Department of Communications Statement

This digital apparatus does not exceed the Class B limits for radio noise emissions from

digital apparatus set out in the Radio Interference Regulations of the Canadian Department

of Communications.

This class B digital apparatus complies with Canadian ICES-003.

DO NOT throw the motherboard in municipal waste. This product has been designed to

enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin

indicates that the product (electrical and electronic equipment) should not be placed in

municipal waste. Check local regulations for disposal of electronic products.

DO NOT throw the mercury-containing button cell battery in municipal waste. This symbol

of the crossed out wheeled bin indicates that the battery should not be placed in municipal

waste.

REACH

Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of

Chemicals) regulatory framework, we published the chemical substances in our products at

ASUS REACH website at http://green.asus.com/english/REACH.htm.

vii

Safety information

Electrical safety

•

To prevent electric shock hazard, disconnect the power cable from the electric outlet

before relocating the system.

•

When adding or removing devices to or from the system, ensure that the power cables

for the devices are unplugged before the signal cables are connected. If possible,

disconnect all power cables from the existing system before you add a device.

•

Before connecting or removing signal cables from the motherboard, ensure that all

power cables are unplugged.

•

Seek professional assistance before using an adapter or extension cord. These devices

could interrupt the grounding circuit.

•

Ensure that your power supply is set to the correct voltage in your area. If you are not

sure about the voltage of the electrical outlet you are using, contact your local power

company.

•

If the power supply is broken, do not try to x it by yourself. Contact a qualied service

technician or your retailer.

• The optical S/PDIF is an optional component (may or may not be included in your

motherboard) and is dened as a CLASS 1 LASER PRODUCT.

INVISIBLE LASER RADIATION, AVOID EXPOSURE TO BEAM.

• Never dispose of the battery in re. It could explode and release harmful substances into

the environment.

• Never dispose of the battery with your regular household waste. Take it to a hazardous

material collection point.

• Never replace the battery with an incorrect battery type.

• RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.

• DISPOSE OF USED BATTERIES ACCORDING TO THE ABOVE BATTERY-RELATED

INSTRUCTIONS.

viii

About this guide

This user guide contains the information you need when installing and conguring the

motherboard.

How this guide is organized

This guide contains the following parts:

•

Chapter 1: Product introduction

This chapter describes the features of the motherboard and the new technology it

supports.

• Chapter 2: BIOS information

This chapter tells how to change system settings through the BIOS Setup menus.

Detailed descriptions of the BIOS parameters are also provided.

Operation safety

•

Before installing the motherboard and adding devices on it, carefully read all the manuals

that came with the package.

•

Before using the product, ensure that all cables are correctly connected and the power

cables are not damaged. If you detect any damage, contact your dealer immediately.

•

To avoid short circuits, keep paper clips, screws, and staples away from connectors,

slots, sockets and circuitry.

• Avoid dust, humidity, and temperature extremes. Do not place the product in any area

where it may become wet.

• Place the product on a stable surface.

• If you encounter technical problems with the product, contact a qualied service

technician or your retailer.

This motherboard should only be used in environments with ambient temperatures between

5ºC (41ºF) and 40ºC (104ºF).

ix

Conventions used in this guide

To ensure that you perform certain tasks properly, take note of the following symbols used

throughout this manual.

DANGER/WARNING: Information to prevent injury to yourself when trying to

complete a task.

CAUTION: Information to prevent damage to the components when trying to

complete a task.

NOTE: Tips and additional information to help you complete a task.

IMPORTANT: Instructions that you MUST follow to complete a task.

Where to nd more information

Refer to the following sources for additional information and for product and software

updates.

1. ASUS websites

The ASUS website provides updated information on ASUS hardware and software

products. Refer to the ASUS contact information.

2. Optional documentation

Your product package may include optional documentation, such as warranty yers,

that may have been added by your dealer. These documents are not part of the

standard package.

Typography

Bold t ex t Indicates a menu or an item to select.

Italics

Used to emphasize a word or a phrase.

<Key> Keys enclosed in the less-than and greater-than sign means

that you must press the enclosed key.

Example: <Enter> means that you must press the Enter or

Return key.

<Key1>+<Key2>+<Key3> If you must press two or more keys simultaneously, the key

names are linked with a plus sign (+).

Example: <Ctrl>+<Alt>+<D>

x

M4A785T-M specications summary

(continued on the next page)

CPU AMD

®

Socket AM3 for AMD

®

Phenom™ II / Athlon™ II /

Sempron™ 100 series processors

Supports 45nm CPU

Supports CPU up to 125W

AMD

®

Cool ‘n’ Quiet™ Technology

* Refer to www.asus.com for the AMD

®

CPU support list

Chipset AMD

®

785G / SB710

Front Side Bus Up to 5200MT/s HyperTransport™ 3.0 interface

Memory Dual-channel memory architecture

4 x 240-pin DIMM slots support maximum 16GB unbuffered ECC

and non-ECC DDR3 1800(O.C.)/1600(O.C.)/1333/1066MHz

memory modules

* Refer to www.asus.com for the latest Memory QVL

(Qualied Vendors List).

** When you install a total memory of 4GB or more, Windows

®

32-bit operating system may only recognize less than 3GB. We

recommend a maximum of 3GB system memory if you are

using a Windows

®

32-bit operating system.

Graphics Integrated ATI Radeon™ HD 4200 GPU

Supports DVI-D with HDCP compliant with max. resolution up to

2560x1600 (@60Hz Dual-link)

Supports HDMI™ with max. resolution up to 1920x1200 (@60Hz)

Supports RGB with max. resolution up to 2048x1536 (@85Hz)

Supports Microsoft

®

DirectX 10.1, OpenGL 2.0, Shader Model 4.1,

Hardware Decode Acceleration for H.264, VC-1, and MPEG-2

Supports Hybrid CrossFireX™ (for Windows

®

Vista only)

Dual VGA output supports:

– RGB & DVI

– RGB & HDMI

Maximum shared memory up to 512MB

* Refer to www.amd.com for the discrete GPUs which support

Hybrid CrossFireX™.

Expansion slots 1 x PCIe 2.0 x16 slot

1 x PCIe x1 slot

2 x PCI 2.2 slots

Storage / RAID AMD

®

SB710 southbridge:

– 1 x Ultra DMA 133/100/66 connector

– 6 x Serial ATA 3Gb/s connectors support RAID 0, RAID 1,

RAID 0+1, and JBOD congurations

Audio VIA

®

VT1708S 8-channel High Denition Audio CODEC

Supports Jack-detection, Multi-streaming, and Front Panel

Retasking technologies

xi

M4A785T-M specications summary

USB Supports up to 12 USB 2.0/1.1 ports (6 ports at mid-board,

6 ports at the back panel)

LAN Realtek

®

8112L PCIe Gigabit LAN controller

ASUS unique

features

ASUS Q-Fan

ASUS CrashFree BIOS 3

ASUS EZ Flash 2

ASUS MyLogo 2

ASUS Express Gate

ASUS AI NET 2

ASUS EPU-4 Engine

ASUS Anti-Surge Protection

ASUS overclocking

features

Intelligent overclocking tool:

– Turbo Key

– GPU NOS

SFS (Stepless Frequency Selection):

– FSB tuning from 200MHz to 550MHz at 1MHz increment

– PCIe frequency tuning from 100MHz to 150MHz at 1MHz

increment

Overclocking Protection:

ASUS C.P.R. (CPU Parameter Recall)

Back panel I/O ports 1 x PS/2 Keyboard port

1 x LAN (RJ-45) port

1 x VGA port

1 x DVI-D port

1 x HDMI port

1 x Optical S/PDIF Out port

6 x USB 2.0/1.1 ports

8-channel audio I/O ports

Internal I/O

connectors

3 x USB 2.0/1.1 connectors support additional

6 USB 2.0/1.1 ports

1 x IDE connector

1 x COM connector

1 x LPT connector

6 x SATA connectors

1 x High denition front panel audio connector

1 x System panel connector

1 x S/PDIF Out connector

1 x CPU fan connector

1 x Chassis fan connector

1 x 24-pin EATX power connector

1 x 4-pin ATX 12V power connector

(continued on the next page)

xii

* Specications are subject to change without notice.

M4A785T-M specications summary

BIOS 8Mb Flash ROM, AMI BIOS, PnP, DMI 2.0, WfM 2.0,

SM BIOS 2.5,ACPI 2.0a, ASUS EZ Flash 2,

CrashFree BIOS 3

Accessories 1 x Ultra DMA 133/100/66 cable

2 x Serial ATA cables

1 x I/O shield

1 x User Manual

Support DVD Drivers

ASUS Update

ASUS PC Probe II

ASUS Express Gate

Anti-Virus software (OEM version)

Form factor MicroATX form factor: 9.6 in x 9.6 in (24.4 cm x 24.4 cm)

1.2 Package contents

Check your motherboard package for the following items.

Motherboard ASUS M4A785T-M motherboard

Cables 2 x Serial ATA cables

1 x Ultra DMA 133/100/66 cable

Accessories 1 x I/O shield

Application DVD ASUS motherboard Support DVD

Documentations User Manual

If any of the above items is damaged or missing, contact your retailer.

Chapter 1

Product introduction

1.3 Special features

1.3.1 Product highlights

1.1 Welcome!

Thank you for buying an ASUS

®

M4A785T-M motherboard!

The motherboard delivers a host of new features and latest technologies, making it another

standout in the long line of ASUS quality motherboards!

Before you start installing the motherboard, and hardware devices on it, check the items in

your package with the list below.

AMD

®

Phenom™ II / Athlon™ II / Sempron™ 100 series CPU

support

This motherboard supports AMD

®

Socket AM3 multi-core processors

with unique L3 cache and delivers better overclocking capabilities

with less power consumption. It features dual-channel DDR3 1333

memory support and accelerates data transfer rate up to 5200MT/s via

HyperTransport™ 3.0-based system bus. This motherboard also supports

AMD

®

CPUs in the new 45nm manufacturing process.

ASUS M4A785T-M 1-1

AMD

®

785G Chipset

The AMD

®

785G Chipset is designed to support up to 5200MT/s

HyperTransport™ 3.0 (HT 3.0) interface speed and PCI Express 2.0

x16 graphics. It is optimized with AMD’s latest AM3 multi-core CPUs to

provide excellent system performance and overclocking capabilities.

HyperTransport™ 3.0 support

HyperTransport™ 3.0 technology provides 2.6 times more bandwidth

than HT1.0 that radically improves system efciency for a smoother and

faster computing environment.

AMD Cool ‘n’ Quiet Technology

This motherboard supports the AMD Cool ‘n’ Quiet technology which

monitors system operation and automatically adjusts CPU voltage and

frequency for a cool and quiet operating environment.

DDR3 1800(O.C.) support

The motherboard supports DDR3 memory that features data transfer

rates of 1800 (O.C.)/1600 (O.C.)/1333/1066 MHz to meet the higher

bandwidth requirements of the latest operation system, 3D graphics,

multimedia, and Internet applications. The dual-channel DDR3

architecture doubles the bandwidth of your system memory to boost

system performance, eliminating bottlenecks with peak bandwidths of up

to 25.6 GB/s. Furthermore, the supply voltage for the memory is reduced

from 1.8 V for DDR2 to just 1.5 V for DDR3. This voltage reduction limits

the power consumption and heat generation of DDR3 which makes it an

ideal memory solution.

PCI Express 2.0 support

This motherboard supports PCI Express 2.0 devices for double speed

and bandwidth which enhances system performance.

S/PDIF digital sound ready

This motherboard provides convenient connectivity to external home

theater audio systems via coaxial and optical S/PDIF_OUT (SONY-

PHILIPS Digital Interface) jacks. The S/PDIF transfers digital audio

without converting it to analog format and keeps the best signal quality.

Hybrid CrossFireX™ support

ATI Hybrid CrossFireX™ technology greatly boosts graphics performance

with an onboard GPU and a discrete graphics GPU.

• Hybrid CrossFireX™ is supported by Windows

®

Vista OS only.

• Refer to

www.amd.com for the discrete GPUs which support Hybrid CrossFireX™.

Chapter 1: Product introduction1-2

Serial ATA 3Gb/s technology

This motherboard supports hard drives based on the Serial ATA (SATA)

3Gb/s storage specications, delivering enhanced salability and doubling

the bus bandwidth for high-speed data saving and retrieval.

8-channel high denition audio

The onboard 8-channel HD audio (High Denition Audio, previously

codenamed Azalia) CODEC enables high-quality 192KHz/24-bit audio

output and jack-detect feature that automatically detects and identies

what types of peripherals are plugged into the audio I/O jacks and noties

users of inappropriate connection, which means there will be no more

confusion of Line-in, Line-out, and Mic jacks.

HDMI support

HDMI (High-Denition Multimedia Interface) is a set of digital video

standards that deliver multi-channel digital audio and uncompressed

digital video for full HD 1080p visuals through a single cable. Supporting

HDCP copy protection such as HD DVD and Blu-ray discs, HDMI

provides you with the highest-quality home theater experience.

Dual VGA output

This motherboard supports dual display output on digital HDMI/DVI and

analog D-Sub. DVI (Digital Visual Interface) provides high quality visuals

for digital display devices like LCD monitors.

1.3.2 Innovative ASUS features

ASUS Express Gate

ASUS Express Gate is an instant-on environment that gives you quick

access to the Internet. Five seconds after powering on your computer,

you can instantly surf the Internet without entering the Windows

®

OS.

• ASUS Express Gate supports installation on SATA HDDs, USB HDDs and ash

drives with at least 1.2GB free disk space. When installing it on USB HDDs or

ash drives, connect the drives to the motherboard USB port before turning on the

computer.

• The actual boot time depends on the system conguration.

• ASUS Express Gate supports le uploading from SATA HDDs, ODDs and USB

drives. It supports le downloading to USB drives only.

• ASUS Express Gate complies with the OpenGL standard. Refer to

support.asus.com

for Express Gate source codes.

ASUS M4A785T-M 1-3

ASUS CrashFree BIOS 3

ASUS CrashFree BIOS 3 is an auto-recovery tool that allows you to

restore a corrupted BIOS le using the bundled support DVD or a USB

ash disk that contains the BIOS le.

ASUS EZ Flash 2

ASUS EZ Flash 2 allows you to update the BIOS from a USB ash disk

before entering the OS.

ASUS EPU

ASUS EPU is a unique power saving technology that detects the current

system loadings and adjusts the power consumption in real time.

ASUS Turbo Key

ASUS Turbo Key allows you to turn the PC power button into

an overclocking button. After the easy setup, Turbo Key boosts

performances without interrupting ongoing work or games, simply through

pressing the button.

ASUS Anti-Surge Protection

This special design prevents expensive devices and the motherboard

from damage caused by power surges from switching power supply

(PSU).

GPU NOS

ASUS GPU NOS technology intelligently detects graphics loading

and automatically boosts performance for the most demanding tasks.

It provides you with a faster reaction time for an excellent graphics

performance.

ASUS MyLogo 2™

Turn your favorite photos into 256-color boot logos to personalize your

system.

ASUS Q-Fan

ASUS Q-Fan technology intelligently adjusts CPU fan speeds according

to system loading to ensure a quiet, cool, and efcient operation.

ASUS AI NET 2

ASUS AI NET 2 remotely detects the cable connection immediately after

you turn on the system and any faulty cable connections are reported

back up to 100 meters at 1 meter accuracy.

Chapter 1: Product introduction1-4

C.P.R. (CPU Parameter Recall)

The BIOS C.P.R. feature automatically restores the CPU default settings

when the system hangs due to overclocking failure. C.P.R. eliminates the

need to open the system chassis and clear the RTC data. Simply shut

down and reboot the system, and the BIOS automatically restores the

CPU parameters to their default settings.

Green ASUS

This motherboard and its packaging comply with the European Union’s

Restriction on the use of Hazardous Substances (RoHS). This is in line

with the ASUS vision of creating environment-friendly and recyclable

products/packaging to safeguard consumers’ health while minimizing the

impact on the environment.

1.4 Before you proceed

Take note of the following precautions before you install motherboard components or change

any motherboard settings.

• Unplug the power cord from the wall socket before touching any component.

• Before handling components, use a grounded wrist strap or touch a safely grounded

object or a metal object, such as the power supply case, to avoid damaging them due to

static electricity.

• Hold components by the edges to avoid touching the ICs on them.

• Whenever you uninstall any component, place it on a grounded antistatic pad or in the

bag that came with the component.

• Before you install or remove any component, switch off the ATX power supply and

detach its power cord. Failure to do so may cause severe damage to the motherboard,

peripherals, or components.

Onboard LED

The motherboard comes with a standby power LED that lights up to indicate that the system

is ON, in sleep mode, or in soft-off mode. This is a reminder that you should shut down

the system and unplug the power cable before removing or plugging in any motherboard

component. The illustration below shows the location of the onboard LED.

ASUS M4A785T-M 1-5

1.5 Motherboard overview

1.5.1 Placement direction

When installing the motherboard, ensure that you place it into the chassis in the correct

orientation. The edge with external ports goes to the rear part of the chassis as indicated in

the image below.

DO NOT overtighten the screws! Doing so can damage the motherboard.

Place this side towards

the rear of the chassis.

1.5.2 Screw holes

Place eight screws into the holes indicated by circles to secure the motherboard to the

chassis.

Chapter 1: Product introduction1-6

1.5.3 Motherboard layout

1.5.4 Layout contents

Connectors/Jumpers/Slots/LED Page Connectors/Jumpers/Slots/LED Page

1. CPU and chassis fan connectors

(4-pin CPU_FAN and 3-pin CHA_FAN)

1-28 8. Clear RTC RAM (3-pin CLRTC) 1-18

2. ATX power connectors (24-pin EATXPWR,

4-pin ATX12V)

1-22 9. SATA connectors (7-pin SATA1-6) 1-24

3. CPU Socket AM3

1-8 10. System panel connector (20-8 pin PANEL) 1-25

4. DDR3 DIMM slots

1-11 11. Onboard power LED (SB_PWR) 1-5

5. Serial port connector (10-1 pin COM1)

1-26 12. USB connectors (10-1 pin USB78, USB910,

USB1112)

1-26

6. LPT connector (26-1 pin LPT)

1-28 13. Digital audio connector (4-1 pin SPDIF_OUT) 1-27

7. IDE connector (40-1 pin PRI_IDE)

1-23 14. Front panel audio connector (10-1 pin AAFP) 1-27

ASUS M4A785T-M 1-7

1.6 Central Processing Unit (CPU)

This motherboard comes with an AM3 socket designed for Phenom™ II / Athlon™ II /

Sempron™ 100 series processors.

1.6.1 Installing the CPU

To install a CPU:

1. Locate the CPU socket on the motherboard.

2. Press the lever sideways to unlock the

socket, then lift it up to a 90°-100° angle.

Socket lever

Ensure that the socket lever is lifted up to a 90°-100° angle; otherwise, the CPU will not t

in completely.

3. Position the CPU above the socket such that the CPU

corner with the gold triangle matches the socket corner

with a small triangle.

4. Carefully insert the CPU into the socket until it ts in place.

The CPU ts only in one correct orientation.

DO NOT force the CPU into the socket to

prevent bending the pins and damaging the

CPU!

Gold triangle

Small triangle

The AM3 socket has a different pinout from the AM2+/AM2 socket. Ensure that you use a

CPU designed for the AM3 socket. The CPU ts in only one correct orientation. DO NOT

force the CPU into the socket to prevent bending the pins and damaging the CPU!

Chapter 1: Product introduction1-8

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Asus M4A785TM Owner's manual

Asus M4A785TM Owner's manual

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